I'm using an external audio interface / usb mixer with my Mac mini (M1 2020, macOS Big Sur). My main outputs are channels 15 & 16. I would need to adjust the outputs of the individual channels by +/- 0.5 dB increments (or more accurately, if possible). In Audio MIDI Setup it's possible to adjust the output levels by +/- 1.0 dB (see picture attached), but is there a way, or perhaps a suitable application, to do this more precisely? Thanks in advance.